File:Journal of morphology (1909) (14771296204).jpg

Identifier: journalofmorphol20wist (find matches)
Title: Journal of morphology
Year: 1909 (1900s)
Authors: Wistar Institute of Anatomy and Biology
Subjects: Morphology Physiology
Publisher: Boston : Ginn & Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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begins, x 259. Fig. 18. Anterior third of a section taken in the plane passing throughCR of Fig. XI. The thinning-out is in the last stages, and at the pointsmarked s a few cells have loosened and sunk down. Otherwise the sub-germinal cavity contains no nucleated cells—only large yolk masses arepresent, some of which are disintegrating (dm). See text for description,and also Figs. 35 and 36. x 259. Fig. 19. Posterior third of the same section as preceding, w, union be-tween the deeper cells of the dorsal-lip and the entoderm. See text andFigs. 35 and 37 for description, x 259. Fig. 20. Anterior part of a section taken in the plane passing throughFH of Fig. XII. Three large degenerating periblastic nuclei are shown(pn), and at y are the cells whicli constitute the inner margin of thegerm-wall. The zone of junction is too far to the left to be seen in thefigure. X 259. Fig. 21. Posterior part of the preceding section. See text, x 259. (lastrulation i/i Ifie Piffeorti Egg.-J-TPatterson
Text Appearing After Image:
.loKiiiiil (if Morphology. Vol.X.X Wini/nFhirif-ffM Plate III. Fig. 22. Right half of a tiaiisverse section tliroiigti tlie plane xx ofFig. XIII. X 259. Fig. 23. A portion of the right side of a section passing through wW ofFig. XIII. X 259. Fig. 24. A portion of the central part of a section passing through vv ofFig. XIII. X 259. Fig. 25. A part of the region of overgrowth from the series which isreconstructed in Fig. XI. It shows a large periblastic nucleus which hasmoved down from the edge of the blastoderm. This is the only periblasticnucleus in the series that was found either beneath or external to theregion of overgrowth, x ^57. Fig. 2G. Posterior portion of a median longitudinal section from a blas-toderm taken thirty-seven hours after fertilization, or four hours beforelaying. At rf is shown the dorsal-lip of the blastopore, which has beenenclosed within the zone of junction. It is doubtful whether the regionmarked gw should be regarded as germ-wall, x 152. Fig. 27. Left side

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